Breast cancer patients who got a mammogram every 12 to 18 months were less likely to have their disease spread to the lymph nodes compared with those who had mammograms at longer intervals, a U.S. study found. "We found doing mammograms at intervals longer than one and a half years essentially does affect patient prognosis. In our study, those patients were found to have a significantly greater lymph node positivity," study author Lilian Wang said. The findings were presented at the annual meeting of the Radiological Society of North America.

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